Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7723a56204d4ac5…

MALICIOUS

PDF

80.2 KB Created: 2021-08-17 21:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbfce70734549bd0cb9a7184bbf9e035 SHA-1: 3630b5f01d1b50c5e6eb79023f6558fee595312f SHA-256: a7723a56204d4ac5215d0d423b97ca94ff9c5b94a9302dc3eb553ea0f75f0577
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/669616a0b8bb6faaf9304d4581f6b243/57000162116.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/121dea8a800227459c2d09d8557d1b45/30304263153.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a8861802daa7105f148cc31a151f277f/80902168527.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c67f776cb---38037856681.pdfIn PDF document text
    • https://rosycaffe.com/file/30127342139.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c204322d6---japobuv.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/714b6a418004fc7c0f19e0e7eef7d0fe/lumiwu.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pisosebujuzewonoz.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8a5e8a0c87bcf7dcdac6adbf9965b6e3/kefijolaniwewanebiwap.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/53350862244.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/donipozabepujuxa.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/aeae20ab04e43c83e5f58b113e768678/fatenazixexipikeburom.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/41433148689.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/matalu.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/dixumadalobanizavopu.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f21dbcc997db06024dc052a300673781/82327395583.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/fadusejafonuti.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1b5b9c9c0934ac750010b1083d780457/35882739246.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/616cc0b757c33834f99ab3d424dff42c/vuraxi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/60312871626.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lozijifugurazegimafex.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/vebog.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/9b29da503834b8272344348f4bae2076/sawigufamumobupolenu.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuripebaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+singer+tradition+2277+sewing+machinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 11120 bytes
SHA-256: be19ce35ff92d1ac6ab61f374988804108f25784d915547f5bdbc8a9b70c3889
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16428 bytes
SHA-256: 3abadf6daa04bd066d5426e1727794c02484ff3a45d68e9bd9905514f7ed8a3c
font_02_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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